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首页> 外文期刊>Journal of Statistical Physics >EFFECT OF LOCAL FIELD FLUCTUATIONS ON ORIENTATIONAL ORDERING IN RANDOM-SITE DIPOLE SYSTEMS
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EFFECT OF LOCAL FIELD FLUCTUATIONS ON ORIENTATIONAL ORDERING IN RANDOM-SITE DIPOLE SYSTEMS

机译：局部场脉动对随机双偶极子系统中有向有序的影响

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Some peculiarities of dipole ordering in systems with uniaxial or cubic anisotropy with an arbitrary degree of dilution are analyzed in terms of random local field theory. The approach takes into account the effect of thermal and spatial fluctuations of the local fields acting on each particle from its neighbors with an accuracy corresponding to that of the Bethe-Paierls pair clusters approach. We show that ferromagnetic (ferroelectric) structure for uniaxial Ising dipoles distributed on a simple cubic lattice is intrinsically unstable against the fluctuations of the local fields for any concentration of the dipoles. This result is quite different from the prediction of the mean-field theory which implies the possibility of ferromagnetic ordering as a metastable state in field-cooled experiments. The local field fluctuations do not exclude, however, antiferromagnetic ordering above a certain critical concentration. Ferromagnetic ordering is possible for other types of lattice geometries and for an amorphouslike dipole distribution above a certain critical concentration. A simple physical explanation of such behavior is given based on the specific angular dependence of the dipole-dipole interaction that results in a relatively high Value of the local field second moment for simple cubic lattice. [References: 25]
机译：根据随机局部场理论，分析了具有任意稀释度的单轴或立方各向异性系统中偶极有序的一些特性。该方法考虑了从其相邻粒子作用到每个粒子上的局部场的热和空间波动的影响，其精度与Bethe-Paierls对聚类方法的精度相对应。我们表明，分布在简单立方晶格上的单轴伊辛偶极子的铁磁（铁电）结构对于偶极子任何浓度的局部场波动，本质上都是不稳定的。这个结果与平均场理论的预测有很大的不同，后者意味着在场冷实验中铁磁有序可能成为亚稳态。但是，局部磁场波动不排除高于某个临界浓度的反铁磁有序。对于其他类型的晶格几何形状以及在某个临界浓度以上的非晶态偶极子分布，铁磁排序是可能的。基于偶极子与偶极子相互作用的特定角度依赖性，给出了这种行为的简单物理解释，这对于简单立方晶格会导致相对较高的局部场第二矩值。 [参考：25]

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